Segment for use in grinding wheels



March 3, 1931. F. E. STRATTON 1,794,992

SEGMENT FOR USE IN GRINDING WHEELS Filed April 2, 1929 v INVENTOR!%Z//M?65Zflm J11; 5. WMQ ,A

ATTORNEY Patented Mar. 3, 1931 UNITED STATES PATENT OFFICE FRANK E.STRATTON, QE PROVIDENCE, RHODE ISLAND, ASSIGNOR TO DIAMOND MA- CHINECOMPANY, or ISLAND 'Application filed April 2,

My invention, relates to grinding wheels particularly of the type madeup of a plurality of abrasive segments supported in a chuck'to form aplane'grinding surface and also to a novel type of an abrasive grindingsegment. One type of grinding wheel known as a ring or cylinder wheelconsists, of a metal chuck which has abrasive segments held be tween adependingannular flange preferably an outer flange and clamping or wedgemema bers to wedgedly retain the segments in position against theannular flange.

Anobject of my. invention is to, provide a novel type of segmentalgrinding wheel for this purpose, and an improved segment for usetherein, which segments are of a standardized form which may be readilyshaped out' of abrasive material in quantity and which are so shapedthat they may be interchangeable in different size chucks therebyobviating in accordance with modern methods of standardization, thenecessity for the production of different shaped segments for differentsized chucks.

A further object of my invention is to fun ther standardize themanufacture of segments of this description by constructing them of ashape easy to mold or manufacture and of a greater inherent strengththan'hitherto. In practice normally an annular outer flange projectsdownwardly from the grinding wheel. chuck and as stated, different sizechucks having flanges of diflerent degrees of curvature areinterchangeably employed. In order that my improved segment may beshaped say for use on. a 36 chuck to 2.30" chuck, I preferably constructthe exterior portions of the outer side thereof of a curvature adaptedto contact and abut for a continuous distance a flange of a chuck of arelatively small diameter and interior portions of the outer sidethereof near the radial center thereof of a degree of curvature adaptedto contact and abut a chuck having a depending annular flange of arelatively larger degree of curvature. In order that the clamping blocksor members which normally have an exterior flat surface as showninPatents Nos. 1,461,514, issued JulylO, 1913 to James A. Burns forGrinding machine and.1,526,953, issued Feb- PROVIDENCE, nnonn ISLAND, ACORPORATION or nnonn snennNT FQR USE IN GRINDING WHEELS 1929. Serial No.358,017.

ruary 17,1925 to Hugo W. Beth for Segmental grinding machine, may beused, I preferably construct at least a portion of the inner side of thesegments flat so that they may flatly abut the outer sides of the chuckmembers. In

order that pressure will not be exerted on the center of the segmentsand will be exerted at points near the exterior ends thereof subof thegrinding wheel and properly cooling the grinding segments. I thereforeconstruct the segments of such a length and locate them in such a mannerin the chuck that they are spaced from each other to provide radial passages for the discharge of detritus and cooling spaces between the endsof each segment which as the end walls of each segment are perpendicularto the base thereof preferably diverge outwardly to provide largercooling spaces and freer passages for the radial dis charge of detritusfrom the center of the grinding wheel.

These and such other objects of my invention asmay hereinafter appearwill be best understood from a description of the accompanying drawings,which illustrate an embodiment thereof.

In the drawings, Fig. 1 is a fragmentary sectional view'of a portion ofa chuck carrying my abrasive segments showing how the segments areusually fastened in place.

Fig. 2 is a fragmentary front elevation of said chuck carrying myabrasive segments.

Fig. 3 is a diagrammatic view illustrating how different portions of theouter side of a segment contact the inner peripheries of the annularflanges of different size chucks.

In the drawings, wherein like characters of reference indicate likeparts throughout, 10 generally indicates a type of chuck suitable forcarrying my improved segments sald chuck is preferably constructed 1naccordance with the showing of the chuck in Patents Nos. 1,461,514 and1,526,953. Said chuck consists of an annular body member 10 having arim12 having a pair of spaced depending annular flanges 14 and 16, bothflanges being part of the member 10. The member 10 is provided with asuitable hub.

18. The inner rim 16 is provided with the chuck members which include aplurality of clamping bolts or'studs 20 adapted to have i the adjustingnuts 22 mounted on the lower round the studs 20 and hold the members 82inposition and the outer block members 48 having at outer sides 50adapted to abut a segment and inwardly projecting portions 52 adapted toabut theouter surface of the inner'members 32.

- Thefchuck construction employed and shown herein issubstantiallysimi-lar to that heretofore referred to and my inventioncon-, sists of a novel typeof grmding segments for usevin a chuck 0fth1sdescription and. such a chuck having said segments mounted therein in anovel manner. The outer flange comprises the depending annular flange14: and the segments 54 are adaptedto be clamped by the clamping block30 against the inner periphery of said flange 14.- V

I employ the abrasive segments 54 of suitable abrasive material such ascarborundum or the like having a plane grinding surface 56 and theopposed sides 58 andeO adapted to be clamped inthe chuck. Gne side,preferably the-inner side v60 thereof is provided with a flat surface 62adapted to be engaged by a clamping member such as'the outer surface ofthe clamping block 30 andipreferably has its center portion cut away asat- 64. so

as to permit the segment to contact the block 48 at the outer portionsthereof only and another. sidepreferably the outer side 58 curved so asto contact a chuck flange. 1 preferably as shown in Fig. 3 construct theexterior'portions 66,0f saidoutereside 58 of a relatively small degreeof curvature to contact a chuck flange 68 of relatively small diametersay, 30" as shown diagrammatically in Fig. 3 and interior portions 70 ofa'relatively larger degree of curvature to contact a chuck flange 72 ofrelatively larger diameter say 36 as also diagrammatically illustratedin Fig. 3. It is therefore obvious that as the exterior portions 62 ofthe inner wall 60' abut the clamping members 48 only that the pressurewill be exerted on the inner periphcry of the annular flange 14 from theexterior ends of the segments only thereby preventing the segments frombuckling in the center.

'74 preferably diverging outwardly as at 76 to provide greater cooling,spaces for the grinding surface between each segment. --For easeofmanufacture'and to permit the divergence of the passages 74 nearthe'outer ends thereof, 1 preferably construct the end walls 7 8 of eachindividual segment perpendicular to the bases or inner sides 60 of eacnsegment. It is thus apparent that as the end walls 7 8 projectperpendicularly upwardly from the bases 60, that said segments 54 arerelatively easy to construct and may be readily moulded in largequantities. e V

It-is thus obvious that'I have provided a novel type of. segmentsoconstructed-that it is adapted to be interchangeable for use in chucksof different diameters its interchangeability depending on the number ofsurfaces of different degrees. of curvatureemployed, one-which isrelatively strong and relatively easyto manufacture and one which whenemployed in. a chuck provides freepassages for the discharge of detritusfrom the grinding wheel and suitable cooling spacesbetween the ends ofeach segment.

I i It is'understood that my invention is not limitedto the specificembodiment shown and that various deviations may be made therefromwithout departing from the spirit and grinding face and opposed sidesadapted to be clamped in a chuck, the inner side thereof having a flatsurface adapted to be engaged by a clamping member and having a centralcut away portion and a curved outer side, exterior portions thereofbeing of a curvature to compactly abut for a substantial distance, aninner chuck flange wall of a relatively small diameter and interiorportions thereof being of a curvature to abut for a substantial idistanoea chuck flange wall of a relatively larger 7 diameter'and sidewalls extending perpendicularly upwardly from said inner side, wherebysaid segment may becompactly retained in a chuck of a relatively largerdiameter or ina chuck of a smaller diameter.

2. An abrasive segment having a plane grinding face and opposed sidesadapted to be clampedin a chuck, the inner side thereof beingadapted tobe engaged by a clamping member and acurved outer side, exteriorportions thereof being of a curvatureto abut for a substantial distance,an inner chuck flange wall of a relatively small diameter and intebeingadapted to be engaged by a clamping member and the outer side thereofhaving portions of different degrees of curvature adapted to compactlyengage for substan tial distances inner chuck flange Walls of dif ferentdegrees of curvature.

4. An interchangeable segment having a grinding face and opposed sidesadapted to be clamped in a chuck, one side thereof being adapted to beengaged by a clamping member and the other side thereof having portionsof different degrees of curvature adapted to compactly engage forsubstantial distances chuck flange Walls of different degrees ofcurvature.

FRANK E. STRATTON.

